R语言 绘制图形中各点之间的箭头 – arrows()函数
R语言中的 arrows() 函数是用来在图形上指定的点之间创建箭头的。
语法: arrows(x0, y0, x1, y1, length)
参数:
x0: 代表绘制箭头的点的x坐标
y0: 代表绘制箭头的点的y坐标
x1: 代表绘制箭头的点的x坐标
y1: 代表绘制箭头的点的y坐标
length: 代表箭头头的边缘长度(英寸)。
例1:
# Specifying points
x0 <- 1
y0 <- 1
x1 <- 5
y1 <- 5
x <- c(x0, x1)
y <- c(y0, y1)
# Output to be present as PNG file
png(file = "arrows1GFG.png")
# Create plot graph
plot(x, y, main = "Arrows Function")
# Create arrow between the points
arrows(x0, y0, x1, y1)
# Saving the file
dev.off()
输出:
例2:
# Specifying points
x <- runif(10, 0, 1)
y <- runif(10, 1, 5)
# Output to be present as PNG file
png(file = "arrows2GFG.png")
# Create plot graph
plot(x, y, main = "Arrows Function")
# Create arrow between the points
s <- seq(length(x) - 1)
arrows(x[s], y[s], x[s + 1], y[s + 1])
# Saving the file
dev.off()
输出: